This week, could we colonise a planet beyond our own galaxy? What's the greenest way to heat my home? And why do bright lights make some people sneeze? It's QA time! Chris Smith is joined by a panel of scientists to take on the questions YOU'VE been sending in. Joining him are chemist Ljiljana Fruk, physiologist Sam Virtue, mathematician and technology journalist Tim Revell and our very own physics boffin Adam Murphy. This episode was produced by Katie Haylor and Izzie Clarke
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